// 动画函数 https://easings.net

const c1 = 1.70158;
const c2 = c1 * 1.525;
const c3 = c1 + 1;
const c4 = (2 * Math.PI) / 3;
const c5 = (2 * Math.PI) / 4.5;

function easeInQuad(x: number) {
    return x * x;
}

function easeOutQuad(x: number) {
    return 1 - (1 - x) * (1 - x);
}

function easeInOutQuad(x: number) {
    return x < 0.5 ? 2 * x * x : 1 - Math.pow(-2 * x + 2, 2) / 2;
}

function easeInCubic(x: number) {
    return x * x * x;
}

function easeOutCubic(x: number) {
    return 1 - Math.pow(1 - x, 3);
}

function easeInOutCubic(x: number) {
    return x < 0.5 ? 4 * x * x * x : 1 - Math.pow(-2 * x + 2, 3) / 2;
}

function easeInQuart(x: number) {
    return x * x * x * x;
}

function easeOutQuart(x: number) {
    return 1 - Math.pow(1 - x, 4);
}

function easeInOutQuart(x: number) {
    return x < 0.5 ? 8 * x * x * x * x : 1 - Math.pow(-2 * x + 2, 4) / 2;
}

function easeInQuint(x: number) {
    return x * x * x * x * x;
}

function easeOutQuint(x: number) {
    return 1 - Math.pow(1 - x, 5);
}

function easeInOutQuint(x: number) {
    return x < 0.5 ? 16 * x * x * x * x * x : 1 - Math.pow(-2 * x + 2, 5) / 2;
}

function easeInSine(x: number) {
    return 1 - Math.cos((x * Math.PI) / 2);
}

function easeOutSine(x: number) {
    return Math.sin((x * Math.PI) / 2);
}

function easeInOutSine(x: number) {
    return -(Math.cos(Math.PI * x) - 1) / 2;
}

function easeInExpo(x: number) {
    return x === 0 ? 0 : Math.pow(2, 10 * x - 10);
}

function easeOutExpo(x: number) {
    return x === 1 ? 1 : 1 - Math.pow(2, -10 * x);
}

function easeInOutExpo(x: number) {
    return x === 0
        ? 0
        : x === 1
            ? 1
            : x < 0.5
                ? Math.pow(2, 20 * x - 10) / 2
                : (2 - Math.pow(2, -20 * x + 10)) / 2;
}

function easeInCirc(x: number) {
    return 1 - Math.sqrt(1 - Math.pow(x, 2));
}

function easeOutCirc(x: number) {
    return Math.sqrt(1 - Math.pow(x - 1, 2));
}

function easeInOutCirc(x: number) {
    return x < 0.5
        ? (1 - Math.sqrt(1 - Math.pow(2 * x, 2))) / 2
        : (Math.sqrt(1 - Math.pow(-2 * x + 2, 2)) + 1) / 2;
}

function easeInBack(x: number) {
    return c3 * x * x * x - c1 * x * x;
}

function easeOutBack(x: number) {
    return 1 + c3 * Math.pow(x - 1, 3) + c1 * Math.pow(x - 1, 2);
}

function easeInOutBack(x: number) {
    return x < 0.5
        ? (Math.pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2
        : (Math.pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2;
}

function easeInElastic(x: number) {
    return x === 0
        ? 0
        : x === 1
            ? 1
            : -Math.pow(2, 10 * x - 10) * Math.sin((x * 10 - 10.75) * c4);
}

function easeOutElastic(x: number) {
    return x === 0
        ? 0
        : x === 1
            ? 1
            : Math.pow(2, -10 * x) * Math.sin((x * 10 - 0.75) * c4) + 1;
}

function easeInOutElastic(x: number) {
    return x === 0
        ? 0
        : x === 1
            ? 1
            : x < 0.5
                ? -(Math.pow(2, 20 * x - 10) * Math.sin((20 * x - 11.125) * c5)) / 2
                : (Math.pow(2, -20 * x + 10) * Math.sin((20 * x - 11.125) * c5)) / 2 + 1;
}

function easeOutBounce(x: number) {
    const n1 = 7.5625;
    const d1 = 2.75;

    if (x < 1 / d1) {
        return n1 * x * x;
    } else if (x < 2 / d1) {
        x -= 1.5 / d1;
        return n1 * x * x + 0.75;
    } else if (x < 2.5 / d1) {
        x -= 2.25 / d1;
        return n1 * x * x + 0.9375;
    } else {
        x -= 2.625 / d1;
        return n1 * x * x + 0.984375;
    }
}

function easeInBounce(x: number) {
    return 1 - easeOutBounce(1 - x);
}

function easeInOutBounce(x: number) {
    return x < 0.5
        ? (1 - easeOutBounce(1 - 2 * x)) / 2
        : (1 + easeOutBounce(2 * x - 1)) / 2;
}

function linear(x: number) {
    return x;
}

const animateFunction = {
    easeInQuad,
    easeOutQuad,
    easeInOutQuad,
    easeInCubic,
    easeOutCubic,
    easeInOutCubic,
    easeInQuart,
    easeOutQuart,
    easeInOutQuart,
    easeInQuint,
    easeOutQuint,
    easeInOutQuint,
    easeInSine,
    easeOutSine,
    easeInOutSine,
    easeInExpo,
    easeOutExpo,
    easeInOutExpo,
    easeInCirc,
    easeOutCirc,
    easeInOutCirc,
    easeInBack,
    easeOutBack,
    easeInOutBack,
    easeInElastic,
    easeOutElastic,
    easeInOutElastic,
    easeInBounce,
    easeOutBounce,
    easeInOutBounce,
    linear,
};

type AnimateEasing = keyof typeof animateFunction;

export default animateFunction;

export { AnimateEasing };
